Odd behavior using multiple rules for the same target

[simon . de . groot]

Hi all,

I have created a makefile that is supposed
to choose between two pattern rules, based on the availability of their
dependencies:

<begin_code>

all : target0.ts
        @echo
Done

target%.ts : file1
        @echo
$?

target%.ts : file2
        @echo
$?

<end_code>

The upper code works just fine. When
I create file1 or file2, the first or the second pattern rule resp. is
used. This changes when I define a random target that uses file1 as dependency.
For some reason, gmake will always try to apply the first pattern rule
and will complain that it cannot create file1, while file2 is there! The
following code illustrates this:

<begin_code>

all : target0.ts
        @echo
Done

target%.ts : file1
        @echo
$?

target%.ts : file2
        @echo
$?

dummy : file1
        @echo
$@

<end_code>

Result:

make: *** No rule to make target `file1',
needed by `target0.ts'.  Stop.

Any ideas why this is, and how to solve
this in a somewhat elegant manner?

Cheers,
Simon.